Where have you been? - a semantic change in progress?

Just a random observation...

Good sentences: I've been to Finland, I'll have been to Finland five times, he's never been to Finland...

Terrible sentences: *I am to Finland, *I will be to Finland, *I was to Finland, **he never is to Finland...

It seems that "been", in some cases, can act as an alternative past participle for "go", replacing "gone". A linking environment is provided by sentences with a bare locative adverb: I've been there / I am there / I will be there are all fine. Presumably, since "I've been there" normally implies "I've gone there" (unless you've been locked up there since birth or something), the "been" was reinterpreted as an even more irregular past participle of "go".

"I'll be there" equally implies "I'll go there", so it's odd that this wasn't extended similarly to allow "*I'll be to Finland" - or so I thought, before checking Google. Google does reveal a couple of instances: "I'll be to bed in a minute", "I'll be to work way early, and perhaps most strikingly, "I've been to more than half of the counties, and in the next six weeks, I'll be to the other half of the counties". So it seems we have a change in progress. Does this depend on the region? Will it culminate in a complete merger of "go" and "be"? Are there any parallels to this outside English? What do you think?